What does the symbol "+" represent?

What does the symbol "–" represent?

The symbol "×" is used for:

What does the symbol "÷" represent?

The symbol "=" means:

The symbol "%" is used for:

What does "√" represent?

What does "∞" mean?

The symbol "∑" means:

What does "∴" stand for?

What does "∝" mean?

The symbol "!" in math stands for:

What does "∫" represent?

The symbol "∪" represents:

What does "≠" mean?